The iconic ball-in-glove logo was Milwaukee's primary one from 1978-1993, and it returned in 2020. What happened from 1994-2019 should be a case study for what not to do, though.
From 1994-1996, the Brewers went from ball-in-glove to an illegible "MB" logo that was featured on their caps and the front of these navy blue alternates. There's nothing especially endearing about the "Brewers" script that had to be arranged around the obnoxiously large 1990s logo either.
In 1997, their final season in the American League, the intertwined "MB" logo was removed from the caps and front of the navy jerseys and moved to the left sleeve. The Brewers did a complete uniform rebrand in 2000, but it would not be until 2020 that they brought back the ball-in-glove logo on a full-time basis.